Means for taking off power from the



March 28, 1950 .1. c. HAEFELI Re. 23,213

MEANS FOR TAKING OFF POWER FROM THE DRIVE TRANSMISSION OF MOTOR VEHICLES Original Filed July 21, 1945 2 Sheets-Sheet 1 i a. f

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), em7 f March 28, 1950 J. c. HA ELI Re. 23,213

MEANS FOR TAKING oFF P w R FROM THE DRIVE TRANSMISSION OF MOTOR VEHICLES Original Filed July 21, 1945 2 Sheets-Sheet 2 v a 3 4 2 I u/1'05 Chaves Haafe i,

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Reissued Mar. 28, 1950 Re. 23,213 FICE MEANS FOR TAKING OFF POWER FROM THE DRIVE TRANSMISSION OF MOTOR VE- HICLES Julius Charles Haefeli, Selly Oak, Birmingham,

England, assignor to The Austin Motor Coinpany Limited, Birmingham, England Original No. 2,453,685, dated November 9, 1948,

Serial No. 606,420, July 21, 1945.

Application for reissue October 25, 1949, Serial No. 123,502. In Great Britain August 7, 1944 3 Claims.

Matter enclosed in heavy brackets appears in the original patent but forms no part of this reissue'specification; matter printed in italics indicates the additions made by reissue The invention relates to what is known as power take-off in motor vehicles required for winch drive and other purposes and has for its object to effect improvements therein.

According to this invention the power is taken from one of the wheels of the change-speed gear and preferably from the speed wheel which is largest in diameter of the lay-shaft and which is usually the third speed wheel. The means comprise a pair of toothed wheels of the same diameter and constituting [rigid with a] an endw-ise slidable [shaft] gear cluster which is preferably in the form of a sleeve with which both wheels are integral. Means are provided to move the [shaft] endwise slidable gear cluster so as to bring either of the wheels into engagement with the respective wheel on the lay shaft. Sufficient space is left between the sliding wheels to ensure that the one cannot engage the lay shaft wheel until the other has disengaged.

When one of the wheels [on the sliding shaft] of the endwise sliding gear cluster hereinafter referred to as the first sliding Wheel is in engagement with the said lay shaft wheel, the othe or second sliding wheel meshes with a gear wheel on the power take-off shaft, whereby drive in one direction is transmitted to it from the lay shaft; and, when the second sliding wheel is slid into engagement with the respective lay shaft wheel, the first sliding wheel engages with a gear wheel [on an idle shaft,] of an intermediate gear cluster, another gear wheel on the latter being constantly in mesh with a gear wheel on the power take-off shaft, whereby everse drive is transmitted thereto.

It is desirable that, when the sliding wheels are in neutral position, the side clearance between either wheel and the said lay shaft wheel be arranged to be slightly less than between either sliding wheel and the wheel which it drives, that is to say the wheel on the power take-off shaft or the respective wheel [on the idle shaft] of the intermediate gear cluster.

Power may be taken from either or both ends of the power take-off shaft.

The arrangement above described forms a simple and reliable means for driving the power take-oil shaft in either direction, or leaving it completely dis-connected; because, when the respective lay shaft wheel is between the two slid ing wheels, and therefore disengaged from both of them, the sliding wheels are also out of mesh both with the said wheel on the powe take-off shaft and with the respective wheel [on the idle shaft,] of the intermediate gear cluster, although the latter may remain continually in mesh with the respective wheel on the power take-ofl shaft. A convenient embodiment of the invention is v described with reference to the accompanying drawings; in which- Figure 1 is a longitudinal sectional plan view of the power take-off means according to the in-,

vention, the section being taken in the planes in-' are; and, v

Figure 3 is a section taken in the plane indi-- :1 cated by the line 3, 3, of Figure 2; and looking in the direction of the arrow of that figure.

In these drawings, A is the power take-off shaft mounted in bearings b, b, of a housing B which is bolted to the gear box C of the vehicle. On. one end of the shaft A is splined a coupling 'a to which may be coupled any wheel or othe part, required to be driven.

Also splined on the shaft A is a spur Wheel D which is constantly in mesh with a spur wheel e at [integral with] one end of a [hollow shaft] gear cluster E turnably mounted on an arbor e set in the housing B. [Integral with] at the other end of the [hollow shaft] gear cluster E is a second spur wheel e All the spur wheels are indicated in Figure 2 by their pitch lines only.

Slidably and turnably mounted on. a second arbor f, set in the housing B, is a [hollow shaft]. gear cluster F [integral with which are] comprising two spur wheels f and f of equal diam-\ eter. The [shaft] gear cluster F is moved endwise by a fork G mounted on a selector rod g (see. Figure 3) and engaging in a groove f of the [shaft] gear cluster F.

H indicates the third speed wheel of the lay shaft of the gear box.

When the [shaft] gear cluster F is moved in the direction contrary to that indicated by the arrow of Figure 1, the wheel f is brought into. mesh with the wheel H and the wheel f with the wheel D on the power take-off shaft, whereby the latter is driven if and when the lay-shaft H is rotating.

Assuming that the lay shaft is turning in an anti-clockwise direction as seen in Figure 2, the power take-off shaft will also be turned in an anti-clockwise direction through the wheels f and D.

When, however, the [shaft] gear cluster F is moved in the direction indicated by the arrow of Figure 1, the wheel f will engage with the layshaft wheel and the wheel f will engage with the wheel e of the [hollow shaft] gear cluster E,

the other wheel e of which is constantly in mesh with the wheel D. As the wheels f and f will be rotating clockwise as before, the wheels e', e, will be rotating anti-clockwise so that the power take-off shaft A will now be driven clockwise or the reverse way.

At the mid position of the [shaft] gear cluster F neither of the wheels f f will be in engagement with the wheel H, so that the power takeoff shaft and the [shaft] gearcluster E will be stationary; the teeth of the wheel H lying between the teeth of the wheels f and f and the spaces between these latter teeth and those of the lay shaft wheel H are arranged to be less than-the respective spaces betwen the wheels f and the wheel D and between the wheel f and Wheel e is greater in diameter than the wheel e so that, when drive is transmitted through these wheels, the speed of the power take off shaft is less than when it is driven directly by the wheel f engaging with the wheel D.

' The power take-off shaft can be utilized either when the vehicle is running or when it is stationairy with the engine running.

Having fully described my invention, what I claim and desire to secure by Letters Patent is:

'1. Means for taking off power from the drive transmission of a, motor'vehiclasaid means comprising an endwise slidable [sleeve,] gear clusterhaving a pair of toothed wheels of the same diameter [rigid with said sleeve], means for moving said [sleeve] gear cluster endwise, a lay shaft wheel of the change-speed gear of the vehicle with which either of said slidable year cluster wheels is engageable, a power take-off shaft, a toothed wheel of said power take-off shaft with which the second 'of said slidable gear cluster wheels engage when the first slidable gear cluster wheel engages said lay shaft wheel, an interme- I diate [sh-aft, a rotatable sleeve mounted upon said intermediate shaft,] gear cluster having "a first toothed wheel [rigid with said rotatable sleeve] with which the first of said slidable gear gageablega power take-off shaft, a toothed wheel of said power take-off shaft with which the second of said slidable wheels engages when the first slidable wheel "engages said lay shaft wheel, an

. intermediate shaft, a rotatable sleeve mounted upon said intermediate shaft, a first toothed wheel rigid with said rotatable sleeve, with which the first of said slidable wheels engages when the second of said slidable wheels engages with said lay shaft wheel, and a second toothed wheel rigid with said rotatable sleeve and in constant mesh with the said toothed wheel of the power take-off shaft.

3. Means fortaking off power from the drive transmission 'of a motor vehicle, said means cornprising an endwise slidable sleeve, a pair of toothed wheels of the same diameter rigid with said sleeve, means for moving'said sleeve endwise, a lay shaft wheel of the change-speed gear of the vehicle, withwhich either of said slidable wheels is engageable, a power take-off shaft, a toothed wheel of said power take-off shaft with which the second -'of said slidable wheel's engages when the first slidable wheel engages said lay shaft wheel, an intermediate shaft, a rotatable sleeve mounted upon said intermediate shaft, -a first toothed wheel rigid with said rotatable sleeve and with which the first of said slidable wheels engages when the second of said slidable Wheels engages with said lay shaft wheel, a second toothed wheel rigid with said rotatable sleeve and in constant mesh with the said toothed wheel of the power take-off shaft, and a housing in which said power take-off shaft, 'said'slidable shaft, and said intermediate shaft are mounted, a casing for the transmission-and said housing being bolted to said casing.

JULIUS CHARLES HAEFELI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS- 

